Medium severity4.3NVD Advisory· Published Jul 8, 2026· Updated Jul 13, 2026
CVE-2026-58214
CVE-2026-58214
Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.
Affected products
3- Range: before 2.14.3 and 2.12.12
Patches
Vulnerability mechanics
References
5- github.com/nats-io/nats-server/commit/297b166be60fe13144084eed4b25201ead03204anvdPatch
- github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97nvdPatch
- github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfjnvdVendor Advisory
- github.com/nats-io/nats-server/releases/tag/v2.12.12nvdRelease Notes
- github.com/nats-io/nats-server/releases/tag/v2.14.3nvdRelease Notes
News mentions
0No linked articles in our index yet.